WatchOS Telegram app cannot connect under cellular data or without the paired iPhone.

Checklist

• I am reporting an issue in existing functionality that does not work as intended
• I've searched for existing GitHub issues

Description

Take a GPS + Cellular Apple Watch. Using Bluetooth or Wi-Fi, telegram app works as expected. However, if the watch switches to cellular data or the iPhone is not near, the Telegram app stops working.

Also, using a GPS Apple Watch, you can see that if you turn bluetooth off and iPhones Wifi off, connection does not work either.

This is because the file:

https://github.com/TelegramMessenger/Telegram-iOS/blob/d1641281452cd521148ba82d14dc878d7c8ae498/submodules/WatchBridge/Impl/Sources/TGBridgeServer.m#L4

This class has not been updated for years, and it's using the old school Watch Connectivity framework, that routes all connectivity throught the companion iOS app.

The good way to implement this is using NSURLSession class, which is far more modern and robust. If the iPhone is avaliable, it will route the traffic via bluetooth, but if it isn't, watchOS can communicate with Telegram on its own.

PLEASE consider implementing this feature. It should not be diffcult (NSURLSession is already used in the iOS app to communicate with Telegram), and there's a lot of people that loves leaving their phones and using just their watch to communicate. This would also give an strategical advantage over WhatsApp, that doesn't even have a watch app.

Expected Behavior

Telegram for watchOS should open normally.

Actual Behavior

Telegram for watchOS cannot connect.

Steps to Reproduce

Using GPS+Cellular over cellular:

1. Turn off bluetooth on the watch
2. Turn off wifi on the watch
3. Open Telegram app on the watch

Using GPS+Cellular or GPS over Wi-fi:

1. Turn off bluetooth on the watch
2. Turn off wifi on the iPhone
3. Open Telegram app on the watch

Screenshots and Videos

Environment

Device: iPhone 12, Watch Series 5 Cellular

iOS version: 14.2

App version: 7.2

Start with submodules/WatchBridge/Impl/Sources/TGBridgeServer.m and review how the current Watch Connectivity path handles traffic between watchOS and the iOS app. Compare that flow with NSURLSession usage in the iOS app and verify the listed cellular and Wi-Fi reproduction steps. Done means Telegram for watchOS can connect when the paired iPhone is unavailable.